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222 lines
8.1 KiB
222 lines
8.1 KiB
commit f6a54a304223666ea4af73260c99c830d7726eca
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Fri Oct 15 14:35:31 2021 -0300
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elf: Fix elf_get_dynamic_info() for bootstrap
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THe d6d89608ac8c broke powerpc for --enable-bind-now because it turned
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out that different than patch assumption rtld elf_get_dynamic_info()
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does require to handle RTLD_BOOTSTRAP to avoid DT_FLAGS and
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DT_RUNPATH (more specially the GLRO usage which is not reallocate
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yet).
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This patch fixes by passing two arguments to elf_get_dynamic_info()
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to inform that by rtld (bootstrap) or static pie initialization
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(static_pie_bootstrap). I think using explicit argument is way more
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clear and burried C preprocessor, and compiler should remove the
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dead code.
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I checked on x86_64 and i686 with default options, --enable-bind-now,
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and --enable-bind-now and --enable--static-pie. I also check on
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aarch64, armhf, powerpc64, and powerpc with default and
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--enable-bind-now.
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(cherry picked from commit 5118dcac68c4eadfd6304bb33adde63d062dc07f)
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Resolved conflicts:
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elf/rtld.c - Manual merge.
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diff --git a/elf/dl-load.c b/elf/dl-load.c
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index fb3da5aa565908a6..a920b12a906a9dec 100644
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--- a/elf/dl-load.c
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+++ b/elf/dl-load.c
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@@ -1296,7 +1296,7 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
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if (l->l_ld != 0)
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l->l_ld = (ElfW(Dyn) *) ((ElfW(Addr)) l->l_ld + l->l_addr);
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- elf_get_dynamic_info (l);
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+ elf_get_dynamic_info (l, false, false);
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/* Make sure we are not dlopen'ing an object that has the
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DF_1_NOOPEN flag set, or a PIE object. */
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diff --git a/elf/dl-reloc-static-pie.c b/elf/dl-reloc-static-pie.c
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index ababafcf98f9945d..757205affe65d9e1 100644
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--- a/elf/dl-reloc-static-pie.c
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+++ b/elf/dl-reloc-static-pie.c
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@@ -25,7 +25,6 @@
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#include <dl-machine.h>
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-#define STATIC_PIE_BOOTSTRAP
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#define RESOLVE_MAP(map, scope, sym, version, flags) map
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#include "dynamic-link.h"
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#include "get-dynamic-info.h"
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@@ -52,7 +51,7 @@ _dl_relocate_static_pie (void)
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break;
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}
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- elf_get_dynamic_info (main_map);
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+ elf_get_dynamic_info (main_map, false, true);
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# ifdef ELF_MACHINE_BEFORE_RTLD_RELOC
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ELF_MACHINE_BEFORE_RTLD_RELOC (main_map, main_map->l_info);
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diff --git a/elf/get-dynamic-info.h b/elf/get-dynamic-info.h
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index 1ac0663d1ff5de24..f63e07dc6d2cd5e6 100644
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--- a/elf/get-dynamic-info.h
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+++ b/elf/get-dynamic-info.h
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@@ -26,7 +26,8 @@
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#include <libc-diag.h>
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static inline void __attribute__ ((unused, always_inline))
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-elf_get_dynamic_info (struct link_map *l)
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+elf_get_dynamic_info (struct link_map *l, bool bootstrap,
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+ bool static_pie_bootstrap)
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{
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#if __ELF_NATIVE_CLASS == 32
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typedef Elf32_Word d_tag_utype;
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@@ -35,7 +36,7 @@ elf_get_dynamic_info (struct link_map *l)
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#endif
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#ifndef STATIC_PIE_BOOTSTRAP
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- if (l->l_ld == NULL)
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+ if (!bootstrap && l->l_ld == NULL)
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return;
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#endif
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@@ -112,47 +113,63 @@ elf_get_dynamic_info (struct link_map *l)
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if (info[DT_REL] != NULL)
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assert (info[DT_RELENT]->d_un.d_val == sizeof (ElfW(Rel)));
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#endif
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-#ifdef STATIC_PIE_BOOTSTRAP
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- assert (info[DT_RUNPATH] == NULL);
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- assert (info[DT_RPATH] == NULL);
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-#endif
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- if (info[DT_FLAGS] != NULL)
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+ if (bootstrap || static_pie_bootstrap)
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{
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- /* Flags are used. Translate to the old form where available.
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- Since these l_info entries are only tested for NULL pointers it
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- is ok if they point to the DT_FLAGS entry. */
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- l->l_flags = info[DT_FLAGS]->d_un.d_val;
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-
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- if (l->l_flags & DF_SYMBOLIC)
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- info[DT_SYMBOLIC] = info[DT_FLAGS];
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- if (l->l_flags & DF_TEXTREL)
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- info[DT_TEXTREL] = info[DT_FLAGS];
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- if (l->l_flags & DF_BIND_NOW)
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- info[DT_BIND_NOW] = info[DT_FLAGS];
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+ assert (info[DT_RUNPATH] == NULL);
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+ assert (info[DT_RPATH] == NULL);
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}
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- if (info[VERSYMIDX (DT_FLAGS_1)] != NULL)
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+ if (bootstrap)
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{
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- l->l_flags_1 = info[VERSYMIDX (DT_FLAGS_1)]->d_un.d_val;
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- if (l->l_flags_1 & DF_1_NODELETE)
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- l->l_nodelete_pending = true;
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-
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- /* Only DT_1_SUPPORTED_MASK bits are supported, and we would like
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- to assert this, but we can't. Users have been setting
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- unsupported DF_1_* flags for a long time and glibc has ignored
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- them. Therefore to avoid breaking existing applications the
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- best we can do is add a warning during debugging with the
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- intent of notifying the user of the problem. */
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- if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0)
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- && l->l_flags_1 & ~DT_1_SUPPORTED_MASK)
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- _dl_debug_printf ("\nWARNING: Unsupported flag value(s) of 0x%x in DT_FLAGS_1.\n",
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- l->l_flags_1 & ~DT_1_SUPPORTED_MASK);
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-
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- if (l->l_flags_1 & DF_1_NOW)
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- info[DT_BIND_NOW] = info[VERSYMIDX (DT_FLAGS_1)];
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+ /* Only the bind now flags are allowed. */
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+ assert (info[VERSYMIDX (DT_FLAGS_1)] == NULL
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+ || (info[VERSYMIDX (DT_FLAGS_1)]->d_un.d_val & ~DF_1_NOW) == 0);
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+ /* Flags must not be set for ld.so. */
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+ assert (info[DT_FLAGS] == NULL
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+ || (info[DT_FLAGS]->d_un.d_val & ~DF_BIND_NOW) == 0);
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}
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- if (info[DT_RUNPATH] != NULL)
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- /* If both RUNPATH and RPATH are given, the latter is ignored. */
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- info[DT_RPATH] = NULL;
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+ else
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+ {
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+ if (info[DT_FLAGS] != NULL)
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+ {
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+ /* Flags are used. Translate to the old form where available.
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+ Since these l_info entries are only tested for NULL pointers it
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+ is ok if they point to the DT_FLAGS entry. */
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+ l->l_flags = info[DT_FLAGS]->d_un.d_val;
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+
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+ if (l->l_flags & DF_SYMBOLIC)
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+ info[DT_SYMBOLIC] = info[DT_FLAGS];
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+ if (l->l_flags & DF_TEXTREL)
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+ info[DT_TEXTREL] = info[DT_FLAGS];
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+ if (l->l_flags & DF_BIND_NOW)
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+ info[DT_BIND_NOW] = info[DT_FLAGS];
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+ }
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+
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+ if (info[VERSYMIDX (DT_FLAGS_1)] != NULL)
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+ {
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+ l->l_flags_1 = info[VERSYMIDX (DT_FLAGS_1)]->d_un.d_val;
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+ if (l->l_flags_1 & DF_1_NODELETE)
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+ l->l_nodelete_pending = true;
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+
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+ /* Only DT_1_SUPPORTED_MASK bits are supported, and we would like
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+ to assert this, but we can't. Users have been setting
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+ unsupported DF_1_* flags for a long time and glibc has ignored
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+ them. Therefore to avoid breaking existing applications the
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+ best we can do is add a warning during debugging with the
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+ intent of notifying the user of the problem. */
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+ if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0)
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+ && l->l_flags_1 & ~DT_1_SUPPORTED_MASK)
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+ _dl_debug_printf ("\nWARNING: Unsupported flag value(s) of 0x%x "
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+ "in DT_FLAGS_1.\n",
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+ l->l_flags_1 & ~DT_1_SUPPORTED_MASK);
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+
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+ if (l->l_flags_1 & DF_1_NOW)
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+ info[DT_BIND_NOW] = info[VERSYMIDX (DT_FLAGS_1)];
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+ }
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+
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+ if (info[DT_RUNPATH] != NULL)
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+ /* If both RUNPATH and RPATH are given, the latter is ignored. */
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+ info[DT_RPATH] = NULL;
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+ }
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}
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#endif
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diff --git a/elf/rtld.c b/elf/rtld.c
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index 37d28d5a66d7b5d6..ad5ddb2a0ab94e7f 100644
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--- a/elf/rtld.c
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+++ b/elf/rtld.c
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@@ -549,7 +549,7 @@ _dl_start (void *arg)
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/* Read our own dynamic section and fill in the info array. */
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bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic ();
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bootstrap_map.l_ld_readonly = DL_RO_DYN_SECTION;
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- elf_get_dynamic_info (&bootstrap_map);
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+ elf_get_dynamic_info (&bootstrap_map, true, false);
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#if NO_TLS_OFFSET != 0
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bootstrap_map.l_tls_offset = NO_TLS_OFFSET;
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@@ -1653,7 +1653,7 @@ dl_main (const ElfW(Phdr) *phdr,
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if (! rtld_is_main)
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{
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/* Extract the contents of the dynamic section for easy access. */
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- elf_get_dynamic_info (main_map);
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+ elf_get_dynamic_info (main_map, false, false);
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/* If the main map is libc.so, update the base namespace to
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refer to this map. If libc.so is loaded later, this happens
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diff --git a/elf/setup-vdso.h b/elf/setup-vdso.h
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index f44748bc9858e5fd..3f20578046de76ed 100644
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--- a/elf/setup-vdso.h
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+++ b/elf/setup-vdso.h
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@@ -64,7 +64,7 @@ setup_vdso (struct link_map *main_map __attribute__ ((unused)),
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l->l_map_end += l->l_addr;
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l->l_text_end += l->l_addr;
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l->l_ld = (void *) ((ElfW(Addr)) l->l_ld + l->l_addr);
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- elf_get_dynamic_info (l);
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+ elf_get_dynamic_info (l, false, false);
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_dl_setup_hash (l);
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l->l_relocated = 1;
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